DS EN 3381:1997 Aerospace Series - Screws, 100 Degree Countersunk Normal Head, Offset Cruciform Recess, Close Tolerance Normal Shank, Short Thread, In Titanium, Anodized, Mos[2] Lubricated - Classification: 1100 Mpa (At Ambient Temperature)/315 Degree C Defines the characteristics of screws, 100 degree countersunk normal head, offset cruciform recess, close tolerance normal shank, short thread, in titanium, anodized, MoS[2] lubricated.